MONGODB（四）——DBObject与JavaBean转换

* 将实体Bean对象转换成DBObject * */ public static <T> DBObject beanToDBObject(T bean) throws IllegalArgumentException, IllegalAccessException { if (bean == null) return null; DBObject dbObject = new BasicDBObject(); // 获取对象类的属性域 Field[] fields = bean.getClass().getDeclaredFields(); for (Field field : fields) { // 获取变量的属性名 String varName = field.getName(); // 修改访问控制权限 boolean accessFlag = field.isAccessible(); if (!accessFlag) { field.setAccessible(true); } Object param = field.get(bean); if (param == null) { continue; } else if (param instanceof Integer) { // 判断变量的类型 int value = ((Integer) param).intValue(); dbObject.put(varName, value); } else if (param instanceof String) { String value = (String) param; dbObject.put(varName, value); } else if (param instanceof Double) { double value = ((Double) param).doubleValue(); dbObject.put(varName, value); } else if (param instanceof Float) { float value = ((Float) param).floatValue(); dbObject.put(varName, value); } else if (param instanceof Long) { long value = ((Long) param).longValue(); dbObject.put(varName, value); } else if (param instanceof Boolean) { boolean value = ((Boolean) param).booleanValue(); dbObject.put(varName, value); } else if (param instanceof Date) { Date value = (Date) param; dbObject.put(varName, value); } // 恢复访问控制权限 field.setAccessible(accessFlag); } return dbObject; }

 

二、 JavaBean转为DBObject 

      /**
     * 将DBObject转换成Bean对象
     * 
     */
    public static <T> T dbObjectToBean(DBObject dbObject, T bean)
            throws IllegalAccessException, InvocationTargetException,
            NoSuchMethodException {
        if (bean == null) {
            return null;
        }
        Field[] fields = bean.getClass().getDeclaredFields();
        for (Field field : fields) {
            String varName = field.getName();
            Object object = dbObject.get(varName);
            if (object != null) {
                BeanUtils.setProperty(bean, varName, object);
            }

        }
        return bean;
    }

    // 取出Mongo中的属性值，为bean赋值
    public static <T> void setProperty(T bean, String varName, T object) {
        varName = varName.substring(0, 1).toUpperCase() + varName.substring(1);
        try {
            String type = object.getClass().getName();
            // 类型为String
            if (type.equals("java.lang.String")) {
                Method m = bean.getClass().getMethod("get" + varName);
                String value = (String) m.invoke(bean);
                if (value == null) {
                    m = bean.getClass()
                            .getMethod("set" + varName, String.class);
                    m.invoke(bean, object);
                }
            }
            // 类型为Integer
            if (type.equals("java.lang.Integer")) {
                Method m = bean.getClass().getMethod("get" + varName);
                String value = (String) m.invoke(bean);
                if (value == null) {
                    m = bean.getClass().getMethod("set" + varName,
                            Integer.class);
                    m.invoke(bean, object);
                }
            }
            // 类型为Boolean
            if (type.equals("java.lang.Boolean")) {
                Method m = bean.getClass().getMethod("get" + varName);
                String value = (String) m.invoke(bean);
                if (value == null) {
                    m = bean.getClass().getMethod("set" + varName,
                            Boolean.class);
                    m.invoke(bean, object);
                }
            }
        } catch (NoSuchMethodException e) {
            e.printStackTrace();
        } catch (SecurityException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (IllegalArgumentException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        }
    }

 

MONGODB（四）——DBObject与JavaBean转换

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